Among recent offending examples, are the following--
"That said...." So many people are using this pat transition or bridge phrase, or, rather, overusing it, that it's become irritating. It's most often used by speakers wishing to appear earnest or filled with conviction. But it becomes a habit. The speaker will make a not particularly important statement, then drop in "that said..." and keep going, as if to qualify (or set off) the preceding phrase, or to indicate a succeeding comparison. Ultimately, it's a stupid phrase which ought to be jettisoned out of speech.
"Duh!" This non-word exclamation is being used by everyone these days. It's intended to signify frustration with an assertion or action of another, usually to show that the assertion is either naive, or too obvious. But, like all non-specific exclamations, it's used indiscriminately, and hence doesn't really mean much. Uneducated or lazy speakers--Valley Girls, anyone?--will use it so frequently that it becomes almost a refrain or lament. "And then I'm, like, duhhh! Like what's that to me? Totally tubular, dude!" Fur sure! Heathers and Debbies of the world, unite!